
<div id="header" >
  <div class="page_margins">
    <div class="page">
      <div id="topnav" >
        <span>
          <?php if ($_SESSION['islogin']): ?>
          欢迎您，<?php echo $_SESSION['username']; ?>
          <a href="/login/out" >退出</a>
          
          <?php else: ?>
          <a href="/login">登陆</a> 
          <?php endif; ?>
        
        | <a href="#">注册</a> </span>
      </div>
      <h1>在线数据字典编辑器</h1>
      <span>程序员的工具箱 - online database dictionary editor</span>
    </div>
  </div>
</div>